- Definitions|1
- Thesaurus|776
- Abbreviations|0
| irrational | |
| maniac(crazy, hysterical, hacked, lunatic, psychotic) | |
| mental | |
| mentally retarded | |
| mongoloid | |
| moronic | |
| not all there(expression, idiom) | |
| nutty | |
| nutty as a fruitcake(expression, crazy, hysterical, hacked, lunatic) | |
| nutty as fruitcake(expression, crazy, hysterical, hacked, lunatic) | |
| off | |
| possessed | |
| queer | |
| retarded | |
| scatter brained(expression, idiom, insanity) | |
| schitzy(crazy, hysterical, hacked, lunatic, psychotic) | |
| schizoid(crazy, hysterical, hacked, lunatic, psychotic) | |
| senseless | |
| shatter brained(expression, idiom, insanity) | |
| sick |
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| APA | Smart Define. (2015). crackbrained thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/crackbrained/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "crackbrained thesaurus" https://smartdefine.org/crackbrained/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, crackbrained thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/crackbrained/thesaurus/synonyms>. |
| MLA | Smart Define. "crackbrained thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/crackbrained/thesaurus/synonyms> |